Controlling Variables

Controlling Variables

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As you create geometry objects and add constraints or constructions, Geometry Expressions creates the required variables; assigns numeric values according to the constraints, constructions, and drawing; and lists any variables you create along with their values in the Variables panel.

The numeric value assigned to a variable is like a sample value; it does not replace the symbolic value the expression. Instead, the application uses the numeric value for four purposes:

  • to determine where to draw the geometric objects on the page,
  • to resolve ambiguous geometry,
  • to determine whether to substitute a positive or negative value for an absolute value when using assumptions, and
  • to take numeric measurements from the drawing.

You dont have to accept the sample values assigned by the application. You can control the values of variables various ways:

  • Assign a value directly.
  • Lock a variable to its current value, so that it wont change when you drag geometry objects in the drawing.
  • Assign a range of values to the variable for creating an animation.

These capabilities are discussed here:

Assignment

Locking

Animation